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Online since: January 2014
Authors: Dong Yu Wan, Chang Qing Cao, Hui Yang
For the fluidized bed, the divided network cells were all carried out using quadrilateral body structure.
It is also found that particle phase forms vortex structure and internal circulation in the bottom of bed.
It is also found that particle phase forms vortex structure and internal circulation in the bottom of bed.
Teymour: Industry of Engineering Chemistry Research, Vol. 42 (2003) No. 12, p.2627
Taghipour: Industry of Engineering Chemistry Research, Vol. 44 (2005) No. 26, p.9818
It is also found that particle phase forms vortex structure and internal circulation in the bottom of bed.
It is also found that particle phase forms vortex structure and internal circulation in the bottom of bed.
Teymour: Industry of Engineering Chemistry Research, Vol. 42 (2003) No. 12, p.2627
Taghipour: Industry of Engineering Chemistry Research, Vol. 44 (2005) No. 26, p.9818
Online since: April 2015
Authors: Jia Horng Lin, Chih Kuang Chen, Yu Te Lin, Rong Siou Jhu, Guan You Chen, Wen Jen Lin
With the advancement of nanotechnology and material chemistry, micelles have emerged as one of the most attractive carriers for anticancer drug delivery.
Of these copolymers, poly(ethylene glycol) (PEG)-block-polyesters are extensively used to form micellar structures.
Well-defined chemical structure of PEG45-b-poly(LA)11-b-poly(LA)11 (i.e., PEG-PLA11-PLA11) was deduced by 1H-NMR.
The size decrease arising from the increase of PLA chain length can be ascribed to the enhanced hydrophobic chain interactions by increasing the length of PLA blocks, which leads to a more compact core structure of PEG-b-PLA-b-PLA.
Of these copolymers, poly(ethylene glycol) (PEG)-block-polyesters are extensively used to form micellar structures.
Well-defined chemical structure of PEG45-b-poly(LA)11-b-poly(LA)11 (i.e., PEG-PLA11-PLA11) was deduced by 1H-NMR.
The size decrease arising from the increase of PLA chain length can be ascribed to the enhanced hydrophobic chain interactions by increasing the length of PLA blocks, which leads to a more compact core structure of PEG-b-PLA-b-PLA.
Online since: September 2020
Authors: Oksana Korobko, Nataliia Kazmirchuk, Svetlana Semenova, Olena Rozhniuk
These parameters, in turn, are determined by the initial conditions of hardening and structure formation.
Activation effect on the structure formation of model systems: 1 – dispersion medium; 2 – filler particle models d1=3 mm; 3 – cluster structures; 4 – special matrix; 5 – filler particle models d2=6 mm; 6 – cluster-cluster structures; 7 – inter-cluster surfaces of partition; t end – end of cluster formation period.
Cluster structures with particles of the smallest size had a close packing and a clew configuration.
This assumes the creation of a developed network of surfaces of partition between cluster structures from filler particles and between the elements of the supra-molecular structure of a matrix material.
Structure, Self-organization, Properties, TES, Odessa, 2010
Activation effect on the structure formation of model systems: 1 – dispersion medium; 2 – filler particle models d1=3 mm; 3 – cluster structures; 4 – special matrix; 5 – filler particle models d2=6 mm; 6 – cluster-cluster structures; 7 – inter-cluster surfaces of partition; t end – end of cluster formation period.
Cluster structures with particles of the smallest size had a close packing and a clew configuration.
This assumes the creation of a developed network of surfaces of partition between cluster structures from filler particles and between the elements of the supra-molecular structure of a matrix material.
Structure, Self-organization, Properties, TES, Odessa, 2010
Online since: May 2017
Authors: Masato Kato, Masashi Watanabe, Taku Matsumoto, Masahiko Machida, Hiroki Nakamura
Defect Chemistry and Basic Properties of Non-Stoichiometric PuO2
Masato Kato1,2 a *, Hiroki Nakamura3,b, Masashi Watanabe2,c,
Taku Matsumoto2,e and Masahiko Machida3,d
1O-arai Research and Development Center, Japan Atomic Energy Agency,
4002 Narita-chou, O-arai machi, Ibaraki 311-1919, Japan
2 Fast Reactor Fuel Cycle Technology Development Division, Japan Atomic Energy Agency,
4-33 Muramatsu Tokai-mura, Ibaraki 319-1194, Japan
3 Center for Computational Science & e-Systems, Japan Atomic Energy Agency,
178-4 Wakashiba Kashiwa-shi, Chiba 277-087, Japan
akato.masato@jaea.go.jp, bnakamura.hiroki@jaea.go.jp, cwatanabe.masashi81@jaea.go.jp, dmatsumoto.taku@jaea.go.jp, emachida.masahiko@jaea.go.jp
Keywords: Defect equilibria, Brouwer diagram, Thermal property, PuO2
Abstract.
Introduction Plutonium dioxide, PuO2, having a fluorite structure, is a compound stable in a wide hypo-stoichiometric region [1].
The relationship among the O/M ratio, electrical conductivity, oxygen diffusion, heat capacity, and thermal conductivity was discussed based on defect chemistry as a function of the oxygen partial pressure and temperature.
The lattice parameter of the fluorite structure is expressed by Eq. 1, , (1) where a is the lattice parameter, rc is the ionic radius of the cation and ra is the ionic radius of the anion.
Introduction Plutonium dioxide, PuO2, having a fluorite structure, is a compound stable in a wide hypo-stoichiometric region [1].
The relationship among the O/M ratio, electrical conductivity, oxygen diffusion, heat capacity, and thermal conductivity was discussed based on defect chemistry as a function of the oxygen partial pressure and temperature.
The lattice parameter of the fluorite structure is expressed by Eq. 1, , (1) where a is the lattice parameter, rc is the ionic radius of the cation and ra is the ionic radius of the anion.
Online since: June 2010
Authors: Wen Yan Wang, Luo Li Li, Jing Pei Xie, Ji Wen Li, Ai Qin Wang
The microstructure morphology characteristics and phase structures of the alloy were
characterized using SEM, TEM and XRD technique.
The results showed that the grains were refined and the micro-nano composite structures were formed under rapid solidification.
Recent research found that rapid solidification can refine the microstructure to reach the micro-nano crystal structure, and to obtain an obvious modification in the size, morphology and distribution of the primary silicon phase in the matrix, which can improve the mechanical properties of the alloys [3-4].
Chemistry and Physics, Vol. 81 (2003), p. 393-395 [7] X.C.
The results showed that the grains were refined and the micro-nano composite structures were formed under rapid solidification.
Recent research found that rapid solidification can refine the microstructure to reach the micro-nano crystal structure, and to obtain an obvious modification in the size, morphology and distribution of the primary silicon phase in the matrix, which can improve the mechanical properties of the alloys [3-4].
Chemistry and Physics, Vol. 81 (2003), p. 393-395 [7] X.C.
Online since: March 2007
Authors: Liang Sheng Qiang, Dong Yan Tang, Xing Hong Zhang, L. Jin
Jin
1,d
1
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China
a
qiangls@sina.com, bdytang@hit.edu.cn, czhanghexin1981@hit.edu.cn,
d
orient_416@yahoo.com.cn
Keywords: Magnesium doped lead titanate ceramics(PMT); Modified sol-gel method;
High-speed synthesis; Electric properties
Abstract.
The changes of structure, microstructure, synthesis process and electric properties of modified ceramics are studied in detail.
The sizes and morphology of high purely and high density magnesium doped lead titanate nanocrystals thus obtained are observed by TEM photographs and the structures and affection of sintering temperature of to lattice constant and sizes of nanocrystals are detected by XRD.
The increase temperature increase the c/a values up to 1.064 of the theoretical value of PMT owing to more apparent trend of in tetragonal system and perfect perovskite-type structures formed.
The changes of structure, microstructure, synthesis process and electric properties of modified ceramics are studied in detail.
The sizes and morphology of high purely and high density magnesium doped lead titanate nanocrystals thus obtained are observed by TEM photographs and the structures and affection of sintering temperature of to lattice constant and sizes of nanocrystals are detected by XRD.
The increase temperature increase the c/a values up to 1.064 of the theoretical value of PMT owing to more apparent trend of in tetragonal system and perfect perovskite-type structures formed.
Online since: April 2009
Authors: Yu Shun Jin, Fei Xiao, Wen Li Guo
The structure of the obtained
PLLA-OH was characterized using both Fourier Transform Infrared (FT-IR) spectroscopy and 1H
nuclear magnetic resonance (1H-NMR) spectroscopy, while their crystallinities and thermo behavior
were studied by differential scanning calorimetry (DSC), separately.
The structure of the polymer was characterized using Fourier-transform infrared spectrometer (FT-IR, American Nicolet-380), Raman spectroscopy (RM2000,RENISHAW, UK) and 1H nuclear resonance ( 1H-NMR, BRUKER DRX AVANCE 400MHz, Switzerland).
In order to confirm whether the functional PLLA-OH molecules exist the C=C further, we used Raman spectroscopy to measure the structure of the functional PLLA-OH.
It showed that the polymer obtained new crystal structures through non-isothermal crystallization process.
Chemistry Online .
The structure of the polymer was characterized using Fourier-transform infrared spectrometer (FT-IR, American Nicolet-380), Raman spectroscopy (RM2000,RENISHAW, UK) and 1H nuclear resonance ( 1H-NMR, BRUKER DRX AVANCE 400MHz, Switzerland).
In order to confirm whether the functional PLLA-OH molecules exist the C=C further, we used Raman spectroscopy to measure the structure of the functional PLLA-OH.
It showed that the polymer obtained new crystal structures through non-isothermal crystallization process.
Chemistry Online .
Online since: May 2022
Authors: Wen Hao Peng, Kai Xuan Shi, Ping Chen, Bin Bin Li
Results and Discussion
First, the energy band structures of pure AgGaS2 and Cr-doped AgGaS2 were calculated and showed in Figure 1.
The band structures of pure (a) and Cr-doped (b) AgGaS2, respectively.
Conclusion In conclusion, we have investigated the band structure and optical properties of pure and Cr-doped AgGaS2 by DFT calculations.
Wang, Electronic structure of ZnTe:O and its usability for intermediate band solar cell.
Inorganic Chemistry, 2018. 57(23): p. 14866-14871
The band structures of pure (a) and Cr-doped (b) AgGaS2, respectively.
Conclusion In conclusion, we have investigated the band structure and optical properties of pure and Cr-doped AgGaS2 by DFT calculations.
Wang, Electronic structure of ZnTe:O and its usability for intermediate band solar cell.
Inorganic Chemistry, 2018. 57(23): p. 14866-14871
Online since: September 2013
Authors: Jana Kosíková, Lenka Mészárosová, Ámos Dufka
The use of Geopolymers in Rehabilitation of Reinforced Concrete Structures
Ing.
Introduction Concrete structures are during their exploitation exposed to environmental effects which – owing to their chemical action – are corrosive and are causing degradation of these structures.
One of the necessary steps to ensure adequate service life of structures is their continuous maintenance and in the case of once damaged structures, their rehabilitation.
This class includes repair materials employable in repairing structures with a static function.
Association for Rehabilitation of Concrete Structures, Brno 2013, ISBN 978-80-260-2210-7), [5] http://www.claypolymers.com.
Introduction Concrete structures are during their exploitation exposed to environmental effects which – owing to their chemical action – are corrosive and are causing degradation of these structures.
One of the necessary steps to ensure adequate service life of structures is their continuous maintenance and in the case of once damaged structures, their rehabilitation.
This class includes repair materials employable in repairing structures with a static function.
Association for Rehabilitation of Concrete Structures, Brno 2013, ISBN 978-80-260-2210-7), [5] http://www.claypolymers.com.
Online since: April 2014
Authors: Ivan Procházka, Oksana Melikhova, Tetyana E. Konstantinova, Wolfgang Anwand, Igor A. Danilenko, Jakub Čížek
Miyayama, The Chemistry of Ceramics, 1st ed, John Wiley & Sons, Chicester, 1996
Byakov, Physical and radiation chemistry of positrons and positronium, in: Y.C.
Schrader (Eds.), Principles and Applications of Positron & Positronium Chemistry, World Scientific, Singapore, 2002, pp. 117– 49
Mogensen, Theory, in: Positron Annihilation in Chemistry, Springer Series in Chemical Physics 58, 1st edition, Springer Verlag, 1995, pp. 15–28
Glazunova, Structure and surface characterization of ZrO2-Y2O3-Cr2O3 system, Appl.
Byakov, Physical and radiation chemistry of positrons and positronium, in: Y.C.
Schrader (Eds.), Principles and Applications of Positron & Positronium Chemistry, World Scientific, Singapore, 2002, pp. 117– 49
Mogensen, Theory, in: Positron Annihilation in Chemistry, Springer Series in Chemical Physics 58, 1st edition, Springer Verlag, 1995, pp. 15–28
Glazunova, Structure and surface characterization of ZrO2-Y2O3-Cr2O3 system, Appl.